The calculated distance (air line) between Sardarapat and Doğubayazıt is approximately 41 miles respectively 65 kilometers.
By car or train, the actual journey to Doğubayazıt is certainly longer, as only the direct route (as the crow flies) between Sardarapat and Doğubayazıt has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles